-R port:host:hostport - communication lost after some minutes

[Hans Schou]

Hi

As this '-R' command initially works fine I guess it must be a bug.

I have to login at a computer which is hidden behind NAT. The user 
(joe) at the computer then connect to my server with the command:
  ssh -R 1234:localhost:22 test.com

Then I login to test.com and connect back to joes computer:
  ssh -p 1234 localhost

I get successfull connection every time but after a few minutes, 
typing some simple commands the communication just stops and I can 
type nothing. The only thing I can do is to ask joe to establish a new 
connection.

Am I doing something wrong?
How can I give a better bug report?

/hans
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